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asm-generic: Refactor dereference_[kernel]_function_descriptor()

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dereference_function_descriptor() and
dereference_kernel_function_descriptor() are identical on the
three architectures implementing them.

Make them common and put them out-of-line in kernel/extable.c
which is one of the users and has similar type of functions.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Helge Deller <deller@gmx.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/449db09b2eba57f4ab05f80102a67d8675bc8bcd.1644928018.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2022-02-15 13:41:04 +01:00
committed by Michael Ellerman
parent 0dc690e4ef
commit e1478d8eaf
6 changed files with 24 additions and 73 deletions
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21
arch/parisc/kernel/process.c
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@@ -263,27 +263,6 @@ __get_wchan(struct task_struct *p)
return 0;
}
#ifdef CONFIG_64BIT
void *dereference_function_descriptor(void *ptr)
{
Elf64_Fdesc *desc = ptr;
void *p;
if (!get_kernel_nofault(p, (void *)&desc->addr))
ptr = p;
return ptr;
}
void *dereference_kernel_function_descriptor(void *ptr)
{
if (ptr < (void *)__start_opd ||
ptr >= (void *)__end_opd)
return ptr;
return dereference_function_descriptor(ptr);
}
#endif
static inline unsigned long brk_rnd(void)
{
return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;